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Changes caching guide to add note on weak etags #23860

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Feb 24, 2016
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Changes caching guide to add note on weak etags #23860

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8 changes: 8 additions & 0 deletions guides/source/caching_with_rails.md
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Expand Up @@ -521,6 +521,14 @@ class ProductsController < ApplicationController
end
```

### A note on weak ETags

Etags generated by Rails are weak by default. Weak etags allow symantically equivalent responses to have the same etags, even if their bodies do not match exactly. This is useful when we don't want the page regenerated for minor changes in response body. If you absolutely need to generate a strong etag, it can be assigned to the header directly.

```ruby
response.add_header "ETag", Digest::MD5.hexdigest(response.body)
```

References
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